SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 60: Theory BMS

T 60.3: Vortrag

Mittwoch, 22. März 2023, 16:20–16:35, HSZ/0201

Leading Logarithmic 3-loop Corrections to (g−2)_µ in the Two-Higgs-Doublet Model — •Kilian Möhling — TU Dresden, Germany

The persistent deviation of the measured value of the anomalous magnetic moment of the muon (g−2)_µ from the prediction in the Standard Model provides us with one of the currently most tantalizing hints at physics beyond the Standard Model. In the near future, increased statistics and improved theoretical calculations will further reduce the uncertainty of this result which in turn puts stronger constraints on new physics models and motivates more precise calculations of the additional corrections.

In this talk I will focus on the Two-Higgs-Doublet Model as one of the promising explanations of the deviation. Here, the dominant contribution to the magnetic moment arises through two-loop Barr-Zee diagrams with large Yukawa couplings to heavy fermion loops. These diagrams bring with them a large uncertainty from QCD corrections at 3-loop order. I will discuss how this uncertainty can be reduced by including large logarithmic 3-loop contributions resummed in the renormalization group equation of an appropriate effective field theory.